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f <br /> California Regional Water Quality Control Board <br /> Central Valley Region 4f <br /> Steven T.Butler,Chair Grafi Danis <br /> Winston H. Ilickox <br /> Seerclar:rfior Sacramento Main Office Gp1111'110'' <br /> l'nvironmental Inlcrnet Address: http:/hvwNN,.swrcb.ca.gov/—rwgcb5 <br /> !'roteclionError! 3443 Routier Road,Suite A,Sacramento,California 95527-3003 <br /> Phone(91 G)255-3000 FAX(9165-3015 / <br /> w FEE <br /> Mr. W. Michael Carroll 1 February 2002 <br /> San ,Joaquin County Department of Public Works FEB 0 5 2002 <br /> Solid Waste Division <br /> P.O. Box 1810 ENU(RONMIENT HEALTH <br /> Stockton, CA 95201 PERKT/SERVICES <br /> HARNEYLANE SANITARYLANDFILL, THIRD QUARTER 2002, GROUND 141A TER AND <br /> SURFACE WATER MONITORING REPORT, SAN JOA QUIN COUNTY(CASE FILE#2598) <br /> We have reviewed the Harney Lane Sanitary Landfill, Third Quarter 2001, Groundwater and Su7face <br /> Water Monitoring Report, dated 15 October 2001. Dichlorodifluoromethane at 1.0 µg/1 and xylenes <br /> (total) at 3.3 µg/1 were detected in MW-2. Retest confirmed detection of dichlorodifluoromethane at <br /> 0.54 µg/1. This constituent has been sporadically detected over the years. Methylene chloride was <br /> detected in MW-4, MW-5 and the trip blank. There is a possible exceedance of EC in MW-4. An <br /> increasing trend was indicated for chloride in MW-2. EPA Method 7199 (ion chromatography) should <br /> be used instead of EPA 7196 (colorimetric) for hexavalent chromium. The Annual 2001 report should <br /> address the evaluation of these detections in groundwater and propose further corrective action. <br /> Recent inspection observations include extensive differential settlement and evidence of ponding on the <br /> landfill. As indicated in the Notice of Violation letter of 22 January 2002, the areas of differential <br /> settlement noted on the landfill cover surface must be repaired. According to Title 27, Section <br /> 21090(b)(1)(A)... In spite of differential settlement, the final cover of closed landfills ... shall be <br /> designed, graded, and maintained to prevent ponding and to prevent soil erosion due to high run-off <br /> velocities... and, (c) Throughout the post closure maintenance period, the discharger shall: (1) maintain <br /> the structural integrity and effectiveness of all containment structures, and maintain the final cover as <br /> necessary to correct the effects of settlement or other adverse factors, and (4) prevent erosion and related <br /> damage of the final cover due to drainage. The County has been directed to submit a workplan proposing <br /> mitigation measures to correct this problem. <br /> The Monitoring Report Compliance Checklist has been attached for your review. It will be included in <br /> the case file for the Harney Lane Sanitary Landfill. If you have any questions,please contact me at (916) <br /> 255-3137 orrss�chwabk@rb5s.swrcb.ca.gov. <br /> KIM A. SCHWAB, RG <br /> Associate Engineering Geologist <br /> cc. Robert McClellon,RENS, Public Health Services, Environmental Health Division <br /> KAS:Ramey 3Q2002 Itr <br /> California Environmental Protection Agency <br /> 01*Recycled Paper <br />